Some random thoughts:
With a bunch of "t"s you get all the same pressure over all the kegs, regardless of style.
Unless you put check valves throughout the system, a leak in one keg could run you flat over the whole system.
When you add a new keg, you'll have to hope (& you'll probably be fine but...) that the new keg doesn't pull gas (or worse liquid) out of your other kegs.
If you naturally carbonate, & you have a keg that doesn't seat well, you might want to give it a small charge to get the seal, until the yeast build up the pressure enough to keep the seal.